// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "gin/function_template.h"

namespace gin {

namespace internal {

    CallbackHolderBase::CallbackHolderBase(v8::Isolate* isolate)
        : v8_ref_(isolate, v8::External::New(isolate, this))
    {
        v8_ref_.SetWeak(this, &CallbackHolderBase::FirstWeakCallback,
            v8::WeakCallbackType::kParameter);
    }

    CallbackHolderBase::~CallbackHolderBase()
    {
        DCHECK(v8_ref_.IsEmpty());
    }

    v8::Local<v8::External> CallbackHolderBase::GetHandle(v8::Isolate* isolate)
    {
        return v8::Local<v8::External>::New(isolate, v8_ref_);
    }

    // static
    void CallbackHolderBase::FirstWeakCallback(
        const v8::WeakCallbackInfo<CallbackHolderBase>& data)
    {
        data.GetParameter()->v8_ref_.Reset();
        data.SetSecondPassCallback(SecondWeakCallback);
    }

    // static
    void CallbackHolderBase::SecondWeakCallback(
        const v8::WeakCallbackInfo<CallbackHolderBase>& data)
    {
        delete data.GetParameter();
    }

} // namespace internal

} // namespace gin
